I usually keep a little lettuce bed growing in a shady area. It's small, just enough to eat. I throw out seeds and the lettuce comes up. I've always used bib lettuce and it takes about a month for it to get big enough to eat. This last time I put out some other type (can't remember what) and it's putting out flowers. Some of the leaves are sort of red and the flowers are right at the top of a middle stalk. The bib lettuce doesn't even have a stalk. Any ideas what is going on?